<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="javascript:void(0);" @click="searchOne('')">全部</a>
                </li>
                <li v-for="(item,index) in subjectNestedList" v-bind:key="index" :class="{active:oneIndex==index}">
                  <a :title="item.title" href="javascript:void(0);" @click="searchOne(item.id, index)">{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"/>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="(item,index) in subSubjectList" v-bind:key="index" :class="{active:twoIndex==index}">
                  <a :title="item.title" href="javascript:void(0);" @click="searchTwo(item.id, index)">{{item.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"/>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':buyCountSort!=''}">
                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                <span :class="{hide:buyCountSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':gmtCreateSort!=''}">
                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                <span :class="{hide:gmtCreateSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                  <span :class="{hide:priceSort==''}">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total == 0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <!-- 数据列表 开始-->
          <article v-if="data.total > 0" class="comm-course-list">
              <ul id="bna" class="of">
                  <li v-for="item in data.items" :key="item.id">
                      <div class="cc-l-wrap">
                          <section class="course-img">
                              <div style="width:255px;height:255px;">
                                <img :src="item.cover" class="img-responsive" :alt="item.title" style="width:100%;height:100%">
                              </div>
                              <div class="cc-mask">
                                <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                              </div>
                          </section>
                          <h3 class="hLh30 txtOf mt10">
                              <a :href="'/course/'+item.id" :title="item.title" class="course-title fsize18 c-333">{{ item.title }}</a>
                          </h3>
                          <section class="mt10 hLh20 of">
                              <span v-if="Number(item.price) === 0" class="fr jgTag bg-green">
                                  <i class="c-fff fsize12 f-fA">免费</i>
                              </span>
                              <span class="fl jgAttr c-ccc f-fA">
                                  <i class="c-999 f-fA">{{ item.viewCount }}人学习</i>
                                  |
                                  <i class="c-999 f-fA">9634评论</i>
                              </span>
                          </section>
                      </div>
                  </li>
              </ul>
              <div class="clear"/>
          </article>
          <!-- /数据列表 结束-->
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)">首</a>
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current-1)">&lt;</a>
            <a
              v-for="page in data.pages"
              :key="page"
              :class="{current: data.current == page, undisable: data.current == page}"
              :title="'第'+page+'页'"
              href="#"
              @click.prevent="gotoPage(page)">{{ page }}</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current+1)">&gt;</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)">末</a>
            <div class="clear"/>
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import course from '@/api/course'

export default {
  data () {
    return {
      page:1,
      data:{}, // 课程列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      // 选中事件样式显示
      oneIndex:-1,
      twoIndex:-1,
      buyCountSort:"",
      gmtCreateSort:"",
      priceSort:""
    }
  },
  //加载完渲染时
  created () {
    //获取课程列表
    this.initCourse()
    //获取分类
    this.initSubject()
  },
  methods: {
    // 查询第一页课程列表
    initCourse(){
      course.getPageList(1,8,this.searchObj).then(response => {
        this.data = response.data.data
      })
    },

    // 查询所有一级分类
    initSubject(){
      course.getAllSubject().then(response => {
        this.subjectNestedList = response.data.data.items
      })
    },

    // 点击一级分类，显示对应的二级分类，并查询一级所有的课程
    searchOne(subjectParentId,index){
      if(subjectParentId === null) {
        this.oneIndex = index
        this.searchObj.subjectParentId = ''
        this.searchObj.subjectId = ''
        this.subSubjectList = []
        this.buyCountSort = ''
        this.gmtCreateSort = ''
        this.priceSort = ''
        this.gotoPage(1)
      }else{
        // 把传递index值给oneIndex，让样式显示
        this.oneIndex = index
        this.searchObj = {}
        this.subSubjectList = []
        this.twoIndex = -1

        // 点击某一个一级分类进行条件查询
        this.searchObj.subjectParentId = subjectParentId
        this.gotoPage(1)

        // 用传过来的id和所有一级id进行比较，如果相同显示二级分类
        for(let i = 0 ; i < this.subjectNestedList.length; i++ ) {
          // 获取每一个一级分类
          let oneSubject = this.subjectNestedList[i]
          // 比较
          if(subjectParentId == oneSubject.id) {
            // 根据一级分类id查询二级分类
            this.subSubjectList = oneSubject.children
          } 
        }
      }
    },

    // 根据二级分类查询课程
    searchTwo(subjectId,index) {
      // 把传递index值给twoIndex，让样式显示
      this.twoIndex = index
      // 点击某个二级分类进行条件查询
      this.searchObj.subjectId = subjectId
      this.gotoPage(1)
    },

    // 根据销量进行排序
    searchBuyCount(){
      // 设置值，让样式显示 （'' 就是不显示，有值就显示）
      this.buyCountSort = 1
      this.gmtCreateSort = ''
      this.priceSort = ''
      // 赋值
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort
      this.searchObj.priceSort = this.priceSort
      // 查询
      this.gotoPage(1)
    },

    // 根据最新时间排序
    searchGmtCreate(){
      // 样式显示
      this.buyCountSort = ''
      this.gmtCreateSort = 1
      this.priceSort = ''
      // 赋值
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort
      this.searchObj.priceSort = this.priceSort
      // 查询
      this.gotoPage(1)
    },

    // 根据价格进行排序
    searchPrice(){
        // 样式显示
      this.buyCountSort = ''
      this.gmtCreateSort = ''
      this.priceSort = 1
      // 赋值
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort
      this.searchObj.priceSort = this.priceSort
      // 查询
      this.gotoPage(1)
    },

    // 分页切换的方法
    gotoPage(page){
      this.page = page
      course.getPageList(page,8,this.searchObj).then(response => {
        this.data = response.data.data
      })
    }
  }
};
</script>
<style scoped>
  .active {
    background: #bdbdbd;
  }
  .hide {
    display: none;
  }
  .show {
    display: block;
  }
</style>